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You can get pretty far by only knowing high-level languages like JS. But if you want to take your coding skills to the next level, you should learn C. With C, you'll learn about pointers, memory allocation, and how everything is just bytes. You'll gain a better intuition into how to write efficient code. Since many modern programming languages are heavily influenced by C, you'll have no problem picking up new programming languages. The book that helped me understand C:
